A statement from solicitors Hodge Jones & Allen, who represented Ms Smith, said: "Eventually, she and other protesters were forced to urinate on the floor of the van with no privacy and while in handcuffs, which was a degrading and humiliating experience."

Ms Smith was then held in a police station and not released until 25 hours after her arrest, despite it being classed a minor offence which only attracts a fine.

She was also put in handcuffs even though she was already in police custody and had not shown resistance and despite the non-violent nature of the offence.

After later accepting a caution, Ms Smith made a complaint to the police regarding the length and conditions of her detention.

It was partially upheld and included a formal apology from police for the amount of time held in the van, the length of time in handcuffs, and the denial of water and toilet facilities.

She then launched a civil claim against the force for assault, false imprisonment and breach of human rights.

Her solicitors added: "The police formally accepted that our client's detention was excessive in length and that she was denied toilet facilities. They argued that their policy of handcuffing all detainees regardless of individual factors was justified, but accepted a risk that a court could find otherwise."

The firm said seven other protesters detained in "similar conditions" were taking action, including five who refused to accept cautions and were later prosecuted by Basildon Council, before their cases were dropped.

The statement added: "The experience of Ms Smith and other Dale Farm protesters reflects flaws in policing of the protests accompanying the evictions.

"Regardless of whether an arrest is legitimate, police officers must be able to justify any further detention hour by hour.

"Further, the claim highlights the fact that once a person has been arrested, they must be taken to a police station as soon as practicable."

Essex Police would not disclose the amount of damages and refused to comment further.